[QA] share owner cannot access other users files

[jnweiger]

Deployed ocis master 2020-12-15 13:00h via hetzner-deploy/make_ocis_test.sh -> ocis/deployments/examples/ocis_traefik/

• login in as einstein, create folder 'for-marie', share with marie as editor.
• login as marie at a diffent browser session, accept the share, upload a png file.
• click on the png file, the media-viewer shows the file. OK
• with einstein's session: navigate into the folder 'for-marie', see that the png file is there.
• click on the png file, the media-viewer fails and shows an exclamation mark on a red triangle. BAD
• try download, rename, delete. all fails. BAD
• also share the folder with user moss
• log in as moss, accept, and test: everything is fine. Okayish

expected behaviour: the share owner should be able to view files too.

[individual-it]

duplicate of #763

[refs]

closing as duplicate of #763

I also tried the described steps and can confirm is no longer happening.